Make citizen's arrest of old woman grabbing girl over ring (4,1,2)
I believe the answer is:
have a go
'grabbing girl over ring' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'make citizen's arrest of old woman' is the wordplay.
I cannot quite see how this works, but
'make' could be 'have' (synonyms) and 'have' is present in the answer.
'of' could be 'o' and 'o' is found in the answer.
'woman' could be 'ag' and 'ag' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for have a go that I've seen before include "Take a turn" , "Make an attempt" , "Words of encouragement" , "Try (to help stop criminal?)" , "Attempt something" .)